Imaging the vasculature of a beating heart by dynamic speckle: the challenge of a quasiperiodic motion

• Main Authors: Akamkam, A. (Author), Colin, E. (Author), Guihaire, J. (Author), Orlik, X. (Author), Plyer, A. (Author)
• Format: Article
• Language: English
• Published: SPIE 2023
• Subjects: algorithm; Algorithms; article; Beating heart; calculation; cardiac imaging; Cardiac imaging; cardiology; Contrast imaging; diagnostic imaging; Diagnostic Imaging; dynamic speckle; Dynamic speckle; heart; Heart; human; Humans; motion; neovascularization (pathology); Neovascularization, Pathologic; optic flow; optical flow; Optical flows; Quasi-periodic motion; signal noise ratio; Signal to noise ratio; Spatial evolution; Speckle; speckle contrast imaging; Speckle contrast imaging; Speckle contrasts; Temporal evolution; vascularization; Vasculature
• Online Access: View Fulltext in Publisher

 The spatial and temporal evolution of the field backscattered by a beating heart while illuminated with a coherent light reveals its macro- and microvascularization in real time. To perform these vascularization images, we use a recently published method of laser speckle imaging, based on the selective detection of spatially depolarized speckle field that is mainly generated by multiple scattering. We consider the calculation of the speckle contrast, by a spatial or temporal estimation. We show that the signal-to-noise ratio of the observed vascular structure can be noticeably increased by a postprocessing method implying the calculation of a motion field that allows the selection of similar frames extracted from different heartbeat periods. This later optimization reveals vascular microstructures with a spatial resolution of the order of 100 μm. © 2023 The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.